Tool



Toon l Filed May s, 1941 K. R. L. GRAUDlNG sepa. 2s, 1943.

Patented Sept. 28, 1943 Y VrrooL n t l l Karl Richard Leopold Gfallliig, StuttgartQGerf many; vested inthe Alien Property Custodian Application May 3, 1941,;SeraLN 3913781 l In Germany April .1091940 Claims.

, The present invention relatesr to machines and tools for driving staples, nails or similar fastening means into bases of various kinds, such as walls and other surfaces, or for securing together various kinds of materials.

, `Tools of this general type have been kno and used, for. example, for stapling together y sheets of paper or cardboard, especially in the fastening element intova base, and channel-:like

means for enclosing andv guiding the staple substantially along all sides during the punching Process. y c n l Since for accurate operation,` the cross-sectional size and shape ,of such guiding surfaces must correspond rather exactly to the cross-sectional size and shape ofthe fastening means, .a tool `of thisknown type can only be used with the same particular type and size of fastening means for which the tool has been built. However, in many lines of trade and industry difierent kinds of fastening means are required and it-has then always been necessary to provide a separate tool for each kind and each size of fastening means. c It isthe object of the present invention to provide a tool ofthe general type describedlabove which is adapted to accommodate and work upon fastening means of various kinds and sizes.

According to the invention, it has been found not to be absolutely necessary to guide the fastening means along all sides, but to be suflicient` to guide, for example,ystaples or crampsalong their parallel Shanks and to prevent the punching elementjfro'msliding off the central portion connecting the two shanks.

' For attaining this object, the present invention provides a punching tool with a plurality of channels having parallel axes and at least partially extending through one another for accommodating and guiding fastening elements of different kinds and sizes.

Another feature of thevinvention is a punching element the cross-sectional area of which corresponds to the total cross-sectional area of the guiding channels and which has in its driving end recesses 1 corresponding to the cross-Section of the/individual channels and cooperating with said channels for guiding the respective fastening elements. Preferably; as will be later described in detail, the depthl of these-recesses in the driving face ofthe punching element increases towards their'lcentre.- f f f The'new. tool is especiallyadaptedfor staplesfor crampsthe central portion of which vis of round 01 Oval ShapeA instead offbeing bent sharply at;

v a'rght angletthe Shanks;

In'l driving av wire cramp into apiece of-Vmate rial, thetpunching member .produces a certain` v spreading effect upontheyshanksrA pressing the: saine tightly against the walls of the guiding channel,` thereby causing 4considerable friction along said walls andrthus :requiringja great deal offorce for driving a cramp or'staple eveny into asoft material.. :1 l f' y f In order to lavoid this disadvantage, according to the invention'=.the width of the guidingchannels increases slightly but gradually towards their ejecting end. In longitudinal lsection( these channels are therefore of avtrapezoidal shape deviating only slightlyffrom a rectangle.

A further; improvement of ther guiding'effect and a greater adaptability of the tool to ,cramps or staples of slightly different size and shape .in one land the same'guiding channel may be obtained according to the invention by tapering the Y.

cross-section of the guiding channel slightly and gradually toward the ejecting endthereof. Thus, if cramps made cfa wire of slightly less thickness than that for which the guiding channel was originally intendedare used,- the above-mentioned spreading action exerted upon them while they are driven in to a base presses them tightly against the walls of thechannel so that they are safely guided thereby.

making thedriving end of the punching member of magnetic material orin magnetizing said end portion so that the fastening element will cling to` the*V punching member and not fall ofi when manipulating the tool the latter is placed ments ofthe invention; in'which plurality of interconnected channels having parin Fig. 12, the ends of the shanks will be forced outwardly and rolled or bent to form an arc or spiral. In this manner, the cramps Will be secured very strongly Within the respective base. y

For facilitating the operation of the tool, viewing slots 30 may be provided in the ejecting end of the channelf, as indicated in Fig. k13. While the tool may have its housing l integrally carrying various arrangements of guide portions, guide carrying inserts may be provided as shown in Figs. 2 and 3 thereby enhancing the value of the tool. The staple ejecting end may* be circular or polygonal, especially wherein certain openings in a piece of work might be encountered, making a particular tool peripheral pattern more desirable.

Although I have described and shown various embodiments of the invention, it is obvious that the same is susceptible Vof many other modifications and improvements, and, therefore, I do not Want to be limited as to the scope of this invention except as deflnedby the appended claims.

I claim: l

1. A tool for driving various types of fastening elements into a base, comprising means forming a channel for guiding the fastening elements, and

- a punching element adapted to drive said fastening elements through and out of said channel and into a base, said channel means consisting of a allel axes and adapted to accommodate fastening elements of dilerenttype or size, the drivingend of said punching member having a cross-section 3. A toolfaccording to claim 1, in which the longitudinal section of at least one of the channels for guiding the fastening elements increases 'in Width slightly and gradually toward the ejecting end, and in which the crossesevction of at least one of the channels is tapering toward the lateral ends thereof.

4. A tool according to claim-1, in which the punching member has in its driving end atleast one recess corresponding to thepcross-section of n the head of a fastening element and cooperating with at least one of said channels for guiding said fastening elements.

5. A tool according to claim 1, in which viewing slots are provided in the ejecting end of the channel.

KARL RIHARD LEOPOLD GRUDING. 

